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Service bulletin M1590

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10248396
Published by NHTSA2024-01-06
Manufacturer's numberM1590
Manufacturer's date2023-12-14
NHTSA componentVEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL

NHTSA's summary

SERVICE BULLETIN M1590: REVOLUTION MAX CRUISE CONTROL SWITCH REPLACEMENT. Purpose: Revision. This bulletin informs dealers that Harley-Davidson has a new part available to allow replacement of the Cruise Control Switch on Revolution® Max powered vehicles. Replacing the entire Left Hand Control Module (LHCM) is no longer required due to a broken cruise control switch. Revision: Updated Required Dealer Action, Add graphic.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Throttle and cruise control

Vehicles listed
HARLEY-DAVIDSON RA12502021 to 2023
HARLEY-DAVIDSON RA1250S2021 to 2023
HARLEY-DAVIDSON RH1250S2021 to 2023
HARLEY-DAVIDSON RH975S2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.